package com.atguigu.eduucenter.mapper;

import com.atguigu.eduucenter.entity.UcenterMember;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.apache.ibatis.annotations.Param;

/**
 * <p>
 * 会员表 Mapper 接口
 * </p>
 *
 * @author Y丶HS练习谷粒商城
 * @since 2022-10-06
 */
public interface UcenterMemberMapper extends BaseMapper<UcenterMember> {
    /**
     * 查询某一天的注册人数
     * @param day
     * @return
     */
    Integer countRegister(@Param("day") String day);
}
